(IPPM) in Vegetables - Vegetableipmasia.org

Resource Manual on IPPM in Rice
World Education Philippines, Inc.
C. The Soil Triangle
Figure 1 shows a textural triangle. The bottom
of the triangle is labelled sand, the left side silt,
and the right side clay. Each side is divided into
100 segments. If people know the percentage of
sand, silt, and clay in the soil, they can easily
determine soil texture. For example, if a soil is
40% sand, 30% silt, and 30% clay, the texture is
clay loam.
Note: To determine the texture, lines from the
sides must be extended in the correct direction.
The triangle is equilateral i.e., all angles are 60
degrees. Proceed as follows:
Clay extend line horizontal from the % clay
i.e., parallel with side labelled sand
Silt extend line downward from % silt at 60 degrees
i.e., parallel with side labelled clay
Figure 1The Soil Triangle
Sand extend line upward from % sand at 120 degrees
i.e., parallel with side labelled silt
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